| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-tightening type snow chain having a tension device more effectively tightened and simply mounted. SOLUTION: The preferred tension device includes: a housing having a top including a set of housing teeth, a bottom and at least one aperture; an actuator interconnected to the housing; a ratchet spool within the housing having a set of ratchet teeth that mate with the housing teeth and a channel between upper and under surfaces to receive at least one cord that is interconnected with the ratchet spool; a tension spring that places a bias on the ratchet spool toward a wind-up direction; and a wave spring. The preferred tension device can be used for various usages not limited to a self-tightening type snow chain device. COPYRIGHT: (C)2010,JPO&INPIT
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